<template>
  <div class="type-nav">
    <div class="container">
      <div @mouseleave="mouseout" @mouseenter="show" class="container-in">
        <h2 class="all">全部商品分类</h2>
        <nav class="nav">
          <a href="###">服装城</a>
          <a href="###">美妆馆</a>
          <a href="###">尚品汇超市</a>
          <a href="###">全球购</a>
          <a href="###">闪购</a>
          <a href="###">团购</a>
          <a href="###">有趣</a>
          <a href="###">秒杀</a>
        </nav>
   <transition name="sort">
          <div class="sort" v-show="shows">
            <div class="all-sort-list2" @click="gosearch">
              <div
                class="item"
                v-for="(c1, index) in categoryList"
                :key="c1.categoryId"
                :class="{ bgcolor: indexs == index }"
              >
                <h3 @mouseenter="bgc(index)">
                  <a
                    :data-categoryName="c1.categoryName"
                    :data-category1Id="c1.categoryId"
                    >{{ c1.categoryName }}</a
                  >
                </h3>
                <div class="item-list clearfix">
                  <div
                    class="subitem"
                    v-for="c2 in c1.categoryChild"
                    :key="c2.categoryId"
                  >
                    <dl class="fore">
                      <dt>
                        <a
                          :data-categoryName="c2.categoryName"
                          :data-category2Id="c2.categoryId"
                          >{{ c2.categoryName }}</a
                        >
                      </dt>
                      <dd>
                        <em v-for="c3 in c2.categoryChild" :key="c3.categoryId">
                          <a
                            :data-categoryName="c3.categoryName"
                            :data-category3Id="c3.categoryId"
                            >{{ c3.categoryName }}</a
                          >
                        </em>
                        >
                      </dd>
                    </dl>
                  </div>
                </div>
              </div>
            </div>
          </div>
        </transition>
      </div>
    </div>
  </div>
</template>

<script>
import { mapState } from "vuex";
import throttle from "lodash/throttle";
export default {
  name: "TypeNav",
  data() {
    return {
      //存储一级分类鼠标所在位置的索引
      indexs: -1,
      shows: true,
    };
  },
  mounted() {
    //通知vuex发送请求，获取数据，纯在仓库里
    this.$store.dispatch("categoryList");
    if (this.$route.path != "/home") {
      this.shows = false;
    }
  },
  computed: {
    ...mapState({
      //map 对象写法，右侧需要的是一个函数，当使用计算属性的时候，右侧函数会立即执行一次
      //注入参数state，state为大仓库的对象
      categoryList: (state) => {
        return state.home.categoryList;
      },
    }),
  },
  methods: {
    //es5写法
    bgc: throttle(function (index) {
      this.indexs = index;
    }, 100),
     bgc(index) {
        this.indexs=index
    },
    mouseout() {
      if (this.$route.path != "/home") {
        this.shows = false;
        this.indexs = -1;
      }
    },
    gosearch(event) {
      /* console.log(event); */
      let element = event.target; //获取当前事件触发的节点
      let { categoryname, category1id, category2id, category3id } =
        element.dataset;
      //节点的dataset属性可以获取到当前节点的自定义属性和属性值
      /* console.log(element);
      console.log(element.dataset.categoryname ); */
      if (categoryname) {
        //整理路由跳转的参数
        let location = { name: "search" };
        let query = { categoryName: categoryname };
        if (category1id) {
          query.category1Id = category1id;
        } else if (category2id) {
          query.category2Id = category2id;
        } else {
          query.category3Id = category3id;
        } //整理完毕
        //判断路由跳转到时候是否带有params参数
        if(this.$route.params){
          location.params=this.$route.params
          location.query = query;
          this.$router.push(location);
        }
        
      }
    },
    //鼠标移入商品列表展示
    show() {
      this.shows = true;
    },
  },
};
</script>

<style scoped lang="less">
.type-nav {
  border-bottom: 2px solid #e1251b;

  .container {
    width: 1200px;
    margin: 0 auto;
    
    .container-in{
      display: flex;
    position: relative;
  .all {
      width: 210px;
      height: 45px;
      background-color: #e1251b;
      line-height: 45px;
      text-align: center;
      color: #fff;
      font-size: 14px;
      font-weight: bold;
    }
    .nav {
      a {
        height: 45px;
        margin: 0 22px;
        line-height: 45px;
        font-size: 16px;
        color: #333;
      }
    }

    .sort {
      position: absolute;
      left: 0;
      top: 45px;
      width: 210px;
      height: 461px;
      position: absolute;
      background: #fafafa;
      z-index: 999;
    
      .all-sort-list2 {
        
        .item {
          
          h3 {
            line-height: 30px;
            font-size: 14px;
            font-weight: 400;
            overflow: hidden;
            padding: 0 20px;
            margin: 0;
            a {
              color: #333;
            }
          }
          h3:hover{
            background-color: #ccc
          }
          .item-list {
            display: none;
            position: absolute;
            width: 734px;
            min-height: 460px;
            background: #f7f7f7;
            left: 210px;
            border: 1px solid #ddd;
            top: 0;
            z-index: 9999 !important;
            .subitem {
              float: left;
              width: 650px;
              padding: 0 4px 0 8px;
              dl {
                border-top: 1px solid #eee;
                padding: 6px 0;
                overflow: hidden;
                zoom: 1;
                &.fore {
                  border-top: 0;
                }
                dt {
                  float: left;
                  width: 54px;
                  line-height: 22px;
                  text-align: right;
                  padding: 3px 6px 0 0;
                  font-weight: 700;
                }

                dd {
                  float: left;
                  width: 415px;
                  padding: 3px 0 0;
                  overflow: hidden;

                  em {
                    float: left;
                    height: 14px;
                    line-height: 14px;
                    padding: 0 8px;
                    margin-top: 5px;
                    border-left: 1px solid #ccc;
                  }
                }
              }
            }
          }

          &:hover {
            .item-list {
              display: block;
            }
          }
        }
      }
    }
    .sort-enter {
      height: 0;
    }
    //过度动画结束状态
    .sort-enter-to {
      height: 461px;
    }
    .sort-enter-active {
      transition: all 0.5s linear;
    }
    }
      
  
    
  }
}
</style>
<!-- .sort-enter {
      height: 0;
    }
    //过度动画结束状态
    .sort-enter-to {
      height: 461px;
    }
    .sort-enter-active {
      transition: all 0.5s linear;
    } -->